[Navy Patriot]

Just speculation, it might be the Russian Flag used for this particular Military Campaign to distinguish it from the standard Russian Federation tricolor.

[Drew68]

Just speculation, it might be the Russian Flag used for this particular Military Campaign to distinguish it from the standard Russian Federation tricolor.

No, it's definitely the DPR flag.

Here's the flags of the Donetsk and Lugansk People's Republics compared with their previous flags as Ukrainian Oblasts (states).